English > radio radiation: 1 sense > noun 1, phenomenon| Meaning | An electromagnetic wave with a wavelength between 0.5 cm to 30,000 m. |
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| Synonyms | radio wave, radio emission |
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| Part of | radio spectrum, radio-frequency spectrum | The entire spectrum of electromagnetic frequencies used for communications |
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| Narrower | Hertzian wave | An electromagnetic wave generated by oscillations in an electric circuit |
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| carrier wave, carrier | A radio wave that can be modulated in order to transmit a signal |
| ground wave | A radio wave propagated / propagated on or near the earth's surface |
| long wave | A radio wave with a wavelength longer than a kilometer (a frequency below 300 kilohertz) |
| medium wave | A radio wave with a wavelength between 100 and 1000 meters (a frequency between 300 kilohertz and 3000 kilohertz) |
| radio signal | A radio wave used to transmit and receive messages |
| short wave | A radio wave with a wavelength less than 100 meters (a frequency greater than 3 megahertz) |
| sky wave | A radio wave that is reflected back to earth by the ionosphere or a communications satellite |
| Broader | electromagnetic radiation, electromagnetic wave, nonparticulate radiation | Radiation consisting of waves of energy associated with electric and magnetic fields resulting from the acceleration of an electric charge |
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| Spanish | emisiones de radio, onda radioeléctrica, ondas de radio |
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| Catalan | emissió de radiació, espectre radioelèctric, ona de ràdio |
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